digitalmars.D - simplify code with macro

Hello, I've got a simple question about what could be done with macros.
void req(lazy bool cond) { if (! cond()) throw new Exception(""); };
void main() {
try {
req(true);
Stdout("everything fine");
req(false);
/*this is not reached*/
} catch {};
}
Could macros be used to turn this into:
---------------------------------------
macro:
req( ... ) -- should be expanded to --> if (! ... ) return false;
void main() {
req(true);
Stdout("everything fine");
req(false);
Stdout("should not be reached");
}
So the expanded version would be:
---------------------------------
void main() {
if (! true) return false;
Stdout("everything fine");
if (! false) return false;
Stdout("should not be reached");
}
This could already be done with mixin:
------------------------------------------
template req(char[] cond) {
const req = "if (! " ~ cond ~ ") return false;";
}
void main() {
mixin(req!("true"));
Stdout("everything fine");
mixin(req!("false"));
Stdout("should not be reached");
}
But the mixin approach is not what I intend to: Simplify the syntax.
From the syntax point of view, usage of exceptions is currently the
best. But it would be a lot of overhead in my case, where a lot of
these "req ( cond )" are used. So a lot of exceptions would have to be
thrown.
Thanks for your replys in advance !
Daniel